REINFORCEMENT OF WELDED BRANCH CONNECTIONS*
ASME
B31.3
(CHEMICAL PLANT AND PETROLEUM
REFINERY PIPING)
With
this method, you may design
·
Reinforcement required for branch connections.
This
method covers the design of piping systems handling all fluids,
including fluidized solids, and to all types o service, including
raw, intermediate, and finished chemicals, oil and other petroleum
products, gas, steam, air, water, and refrigerants, except as provided
below (See para. Exclusions).
You
may also obtain :
- Wall
Thicknesses required (Header
"run" and Branch)
- Area
of Reinforcement required
- Area
of Reinforcement available
- Cross-sectional
area of various welds available for reinforcement
- Cross-sectional
area of material added as reinforcement
- Total
Area Available
- Size
of reinforcing pad (if required)
- Size
of fillet welds (Outside and reinforcing pad fillet-if required)
Furthermore
you will be able to:
·
Check your existing branch connections for different conditions
.
·
Check your reinforcement of openings design modifying someone of
the parameters as follows:
·
Design Pressure (internal).
· Design Temperature.
· Thicknesses (Header and Branch).
· Diameters (Header and Branch).
· Material Specification : Header, Branch.
· Reinforcing Pad Material.
· Corrosion Allowance (Header and Branch).
EXCLUSIONS
(1) Packaged Equipment Piping. Piping which interconnects individual
pieces or stages of equipment within a packaged equipment assembly
shall be in accordance with B31.3, except that packaged refrigeration
piping may conform to either B31.3 or B31.5.
(2) This Calculation Method excludes the following:
- Piping
systems designed for internal gage pressures at or above zero
but less than 15 psi (103 kP) provided the fluid handled is nonflammable,
nontoxic, and not damaging to human tissue as defined in para
300.2, and its design temperature is from -20°F (-29°C)
through 366°F (186°C);
- power
boilers in accordance with BPV Code Section I and boiler external
piping which is required to conform to B31.1;
- tubes,
tube headers, crossovers, and manifolds of fired heaters, which
are internal to the heater enclosure;
- pressure
vessels, heat exchangers, pumps, compressors, and other fluid
handling or processing equipment, including internal piping and
connections for external piping;
- piping
located on company property which has been set aside for pipelines
conforming to B31.4 or B31.8 or applicable governmental regulations;
- plumbing,
sanitary sewers, and storm sewers; and
- fire
protection systems constructed in compliance with insurance underwriters'
or other recognized fire protection engineering standards.
Notes:
-
This method applies ASME CODE B31.3 para.304.1.2 (a) "Pressure
Design of Metallic Components".
- For t>=D/6 (t:Required thickness of the pipe, D:Outside Diameter
of the pipe), Calculation of pressure design thickness for straight
pipe requires special consideration of factors such as theory of
failure, and thermal stress.
- This
method is
not applicable for high Pressures. (High Pressure: Pressure in excess of that
allowed by the ANSI B16.5 Class 2500 rating for the specified design
temperature and material group).
EXIT
DATA SHEET IS AS FOLLOWS :
To
introduce
the variables you must fill in a sheet as follows :
INPUT
FOR CALCULATION METHOD
REINFORCEMENT
OF WELDED BRANCH CONNECTIONS*
ASME
B31.3
(CHEMICAL PLANT AND PETROLEUM
REFINERY PIPING)
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